It seems fairly straightforward to claim that significantly changing water chemistry is very bad, or at least very risky, for aquatic ecosystems many of whose s

It seems fairly straightforward to claim that significantly changing water chemistry is very bad, or at least very risky, for aquatic ecosystems many of whose species are very sensitive to water chemistry. The "positive" here is supposed to be that widespread destruction of land ecosystems might be even more severe if not for the oceans also taking some of the damage? (I doubt that is true in the long run. Many global processes are dependent on functioning living oceans.)